The Didymium NIST Traceable Wavelength Reference Cell, in perchloric acid, sealed in quartz cells, NIST Traceable with UKAS ISO 17025 accredited certificate of calibration. The primary usage is for assessment of wavelength scale accuracy in the Visible spectrum, with a usable range of 290nm to 870nm. The filled far UV quartz cell that has been permanently heat sealed
Didymium has been used as a visible wavelength standard in the form of a glass filter. We now offer a quartz cell filled and permanently sealed with a didymium perchloric solution that will evaluate more effectively the optical performance of your instrument. Didymium offers sharp, stable peaks over the range of 290 to 870nm. The primary use of Didymium is to assure that the wavelength scale of your instrument is within the manufacturer's tolerances of the actual wavelength being measured. The use of the filled quartz cell assures that the optical configuration for your quality control is exactly the same as for a normal analysis
Didymium presents a wide range of crisply resolvable peaks which are easily used to correlate the wavelength indicator on your spectrophotometer to the known peak. The first procedure should be to scan the cell over the useable range to assure that all peaks can be resolved. Adjust the slit width and scan rate to produce a usable spectra. Check each peak to assure that the reading on your spectrophotometer is within the manufacturer's tolerances of the wavelength readout. If not, get a service technician to adjust or recheck your instrument. Didymium is measured against an air blank. Periodically check the spectra, at a minimum in the area where you are doing your analysis. Periodic use of the Didymium cell will build a log of your instrument’s spectral accuracy for use with certification and troubleshooting should the correlation change over time.